synapse/changelog.d/9540.feature
Richard van der Hoff 8a4b3738f3
Replace last_*_pdu_age metrics with timestamps (#9540)
Following the advice at
https://prometheus.io/docs/practices/instrumentation/#timestamps-not-time-since,
it's preferable to export unix timestamps, not ages.

There doesn't seem to be any particular naming convention for timestamp
metrics.
2021-03-04 16:40:18 +00:00

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Gherkin

Add `synapse_federation_last_sent_pdu_time` and `synapse_federation_last_received_pdu_time` prometheus metrics, which monitor federation delays by reporting the timestamps of messages sent and received to a set of remote servers.